Why does yarn keep checking installed packages?

Question

Yarn

The question is, I use verdaccio to cache packets to carry them to work where there is no network. I install yarn packages, in one folder, 60000 packages have already accumulated. When installing each package, apparently, each package is recalculated and checked, i.e. yarn does something for about 2 minutes... how can you tell it not to do that, but just install the package and that's it?